我在尝试实现Github上开源的代码Relation-Shape-CNN，运行报错ModuleNotFoundError: No module named '_ext.pointnet2._pointnet2'。
Traceback (most recent call last):
File "train_cls.py", line 10, in
from models import RSCNN_SSN_Cls as RSCNN_SSN
File "/media/lab/16DE307A392D4AED/zs/Relation-Shape-CNN-master/models/__init__.py", line 1, in
from .rscnn_ssn_cls import RSCNN_SSN as RSCNN_SSN_Cls
File "/media/lab/16DE307A392D4AED/zs/Relation-Shape-CNN-master/models/rscnn_ssn_cls.py", line 9, in
from pointnet2_modules import PointnetSAModule, PointnetSAModuleMSG
File "/media/lab/16DE307A392D4AED/zs/Relation-Shape-CNN-master/models/../utils/pointnet2_modules.py", line 5, in
import pointnet2_utils
File "/media/lab/16DE307A392D4AED/zs/Relation-Shape-CNN-master/models/../utils/pointnet2_utils.py", line 11, in
from ext import pointnet2
File "/media/lab/16DE307A392D4AED/zs/Relation-Shape-CNN-master/models/../utils/_ext/pointnet2/_init__.py", line 3, in
from ._pointnet2 import lib as _lib, ffi as _ffi
ModuleNotFoundError: No module named '_ext.pointnet2._pointnet2'
请哪位大神可以指导一下，非常感谢！！！
